Sharepoint lists mirroring issue

Since some lists are mirroring successfully while others fail, I would first look at the schema of the failing SharePoint lists rather than the Fabric capacity or connection.

One thing worth checking is whether the failing lists contain duplicate column names. SharePoint can allow two columns with the same display name if one was renamed and recreated, but Fabric mirroring may fail during schema replication.

There is actually a similar case in the Fabric community where this exact error was resolved by identifying duplicate column names.

I would also check the mirroring monitoring logs to see whether the failure occurs during ReplicatingSchema or data replication.

Reference: Similar SharePoint mirroring issue and confirmed solution.

Worth checking this before recreating all the connections.